Messages in this thread | | | Date | Thu, 25 Mar 2004 19:01:09 -0500 | From | Jeff Garzik <> | Subject | Re: "Enhanced" MD code avaible for review |
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Justin T. Gibbs wrote: >>Jeff Garzik wrote: >> >>Just so there is no confusion... the "failing over...in userland" thing I >>mention is _only_ during discovery of the root disk. > > > None of the solutions being talked about perform "failing over" in > userland. The RAID transforms which perform this operation are kernel > resident in DM, MD, and EMD. Perhaps you are talking about spare > activation and rebuild?
This is precisely why I sent the second email, and made the qualification I did :)
For a "do it in userland" solution, an initrd or initramfs piece examines the system configuration, and assembles physical disks into RAID arrays based on the information it finds. I was mainly implying that an initrd solution would have to provide some primitive failover initially, before the kernel is bootstrapped... much like a bootloader that supports booting off a RAID1 array would need to do.
Jeff
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